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- Triticum aestivum[remove]6
- Zea mays[remove]6
- agricultural runoff[remove]6
- corn5
- AgSpace4
- Glycine max4
- ammonium nitrogen4
- nitrate nitrogen4
- nitrogen4
- phosphorus4
- soybeans4
- crop residues3
- losses from soil3
- nonpoint source pollution3
- winter wheat3
- crop rotation2
- grain crops2
- phosphates2
- pollution control2
- rain2